Brand： Allen Bradley
Model number：1764-MM1RTC
Colour：new
Warranty: 12 months
Lead Time：3-day working day
Country of origin: USA Price: Please contact us
Product weight：0.21kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
Description:
Transformer Sizing
The Ultra3000 does not require isolation transformers. However, a
transformer may be required to match the voltage requirements of the
controller to the available service. To size a transformer for the main
AC power inputs, the power output (KVA) of each axis must be
known. This can be derived by calculating the horsepower for each
axis and converting that horsepower into units of watts. If you are
supplying power to more than one motor and an Ultra3000, simply
add the kW ratings together from each calculation to get a system kW
total.
Definitions:
kW = power or real power
KVA = apparent power
Transformer KVA rating = (Sum of average output power of each axis)
x 2.0.
Metric Standard English
Where T is temperature difference between
inside air and outside ambient (°C), Q is heat
generated in enclosure (Watts), and A is
enclosure surface area (m2
). The exterior surface
of all six sides of an enclosure is calculated as
Where T is temperature difference between
inside air and outside ambient (°F), Q is heat
generated in enclosure (Watts), and A is
enclosure surface area (ft²). The exterior surface
of all six sides of an enclosure is calculated as
A = 2dw + 2dh + 2wh A = (2dw + 2dh + 2wh) / 144
Where d (depth), w (width), and h (height) are in
meters.
Where d (depth), w (width), and h (height) are in
inches.
IMPORTANT If using an autotransformer, ensure that the phase to
neutral/ground voltages do not exceed the input
voltage ratings of the drive.
Example: sizing a transformer to the voltage requirements of an
2098-DSD-020 and MPL-A320P motor:
The speed/torque curve information for 230V motors is based upon
an Ultra3000 input voltage of 230V ac. For a 115V ac input voltage, the
maximum speed can be reduced up to one half.
IMPORTANT If you are using the Rockwell Automation/
Allen-Bradley system sizing program, the average
speed and average torque data has already been
calculated and can be used in the above equation. If
you are not sure of the exact speed and torque in
your application, another approach is to look at the
speed/torque curve for your Ultra3000/motor
combination and use the values for the worst case
continuous speed and torque.
IMPORTANT Calculations are multiplied by a factor to compensate
for the power and loss elements within a power
system. A factor of 2.0 is used with a single phase
system and a factor of 1.5 is used with a three phase
system. This factor should minimize the effects of the
secondary line voltage sagging in the transformer
during peak current periods.
External Shunt Resistor
Observe the following guidelines when mounting your external shunt
resistor (refer to Figure 1.9 and for an example).
• Mount circuit components and wiring in the very dirty zone or in
an external shielded enclosure. Run shunt power and fan wiring
inside metal conduit to minimize the effects of EMI and RFI.
• Mount resistors (other than metal-clad) in a shielded and
ventilated enclosure outside the cabinet.
• Keep unshielded wiring as short as possible. Keep shunt wiring as
flat to the cabinet as possible.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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